Damper-regulator mechanism for steam-pressure apparatus.



J. L. KIMBALL. DAMPER REGULATOR MECHANISM FOR STEAM PRESSURE APPARATUS. APPLICATION FILE D MAR. 26. 1915.

1,155,822. Patented 001;. 5,1915.

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JA-IVEES In KIMBALL, 0E MASMGEHSETTS, .A SSIGN O'R "DO G. RUGGIZES 00:, OF BOS'llOzN', MSSACHUSETES;.,A CORPORATION: OF MASSACHUSETTS.

DAMPER-REGULATOR- MECHANISM For, srEAM-rREssURn APPARATUS.

Specification of Letters Batent Applicationfiled Marchfifi, 1915. Serial No; 17,297.

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Be it known: that 1 I once Knvresnn, aoiti-zen of the- United States, residing at Salem, in the county of Essex and State of Massachusetts, have invented an Improvement in Damper lhcgul ator Mechanism for Steam-Pressure; Apparatus, of which the following is a specification.-

This-invention: relates to damper reg u-lator mechanism ct steam pressure ratus and has to do more particularly with improved means for controlling the flow of fluid to: the motor operating the damper an; apparatus oii this character which may be of the type show-n the patent to Locke, No. coerce, patented November so, 1888.

As is well lmown the best'r'esu lts are" obtained in: a steam generating plan with a damper regulator which will hold the dam-- per at a partial stroke, only allowing sulficient hot gases to enter the flue to create the necessary draft toburn the coal and keepupa uniform pressure.- lo the damper rogulators for this purpose the prior artso far as knowntome the controlling valve mechiior the motor which operates the damper is formed with sliding spindle con-- trolling the ports and order to prevent leakage it is necessary to have a considerable la-pover the ports. This results'in lost motion between the damper" its controller mechanism producing objectionable variations in steam pressure and a corresponding loss in heat units.- It will be un d erstood that an apparatus of this type, whether the draft be forced,;induced or ural it should be automatically regulated within very close limits, and this regulation" should be accomplished gradually yet with a precision that will insure steady steam pressure and the best furnace conditions.

In accordance with the present invention the damper audits motor areequ-ipped with a pilot valve connected to be governed by the steam pressure, and of a type wherein the inlet port tothe'moto-r and also the exhaust are controlled in proper-sequence without any lap or lost motion a manner so that a quick and delicate response is had to movement's given the valve stem or the valve body as the steam governor and the damper motor operate, To these ends I provide a valve body with a valve device therein consisting in asleeve formed with a conical tip constituting one: valve member and astem slidab-le Within such; sleeve constituting an other valve member, one of said valve members being adapted to control the exhaust from the motor, the other the inlet thereto. The invention will be better understood from the following detailed description taken connection with the accompanying drawings and will be thereafter pointed out in: the appended claims;

Referring to, the drawings Figure 1 shows central vcitical section a valve deviceconstructed in accordance with my invention; and Fig; 2 is a fragmentary elev-a'tion at rig ht angles to Fig.1 showing the yoke dean-cc for operating the valve. Fig; 3 is a side elevation of the valve-device associated with the motor.

Thc" valve body is indicated at 16 with a nipple connection l1 atone side; which lead th ough a pipe I2- to the motor 13. In"

practice this valve body may haveasmall range or vertical movement imparted there- PatentedOo-t. 5, 1915 i to by means similar to that of said Lockepatent, the pipe 12 springing sufficiently to permit this. inlet nipple connection is indicated at M and aneXhaust connection at 15-,- though it will be understood that in certain aspects of the invention these are interchangeable. These several connections lead to a longitudinal bore 16 which is closed at its lowerend by a threaded cap I? fitted in the bore 16. Between the inlet 14% and the motor connection ll is ablock 18- having a bore therethrough and a conical seat ati-ts top for a conical valve for-- niation 20 at the lower end of a sleeve 21 which is-slid-ably' fitted in the upper part of the bore l6 being guided through hollow blocks 22' fitted in said bore each side of V The sleeve 2'1- reduced portion 26 just below the apertures 24 adapted to permit the passage of fluid and a valve head 2? at its lower end. The

valve head 27 is shown as equipped with;

a conical upper face 28 adapted when raised to the position "shown to seat on a the damper is wide open.

corresponding formation of the sleeve and close the passage through the sleeve, the valve head below this valve seat being of cylindrical plug form fitting closely the reduced walls of the sleeve opposite the apertures 23 as seen at 29 so as to cooperate for completely cutting off the steam. The stem 25 is held normally lifted with relation to the sleeve so that the valve 28 is closed by a coil spring 30 reacting between the end of the sleeve and an adjustable stop collar 31 on the stem. An operating yoke is indicated at 32 for lifting the inlet valve 20 or closing the same and lifting the exhaust valve 28 according to the steam pressure conditions, this yoke being connected for actuation by the governor as set forth in said patent.

It will be understood that whenever a slight reduction in the steam pressure occurs the yoke 32 will be moved downward by the governor beam, thus moving the stem 25 downward and opening the exhaust valve 28. Thereupon the piston of the motor will move downward as the water exhausts, and presently the body 10 of the valve will be moved downward by the cut off cam as ex plained in said patent, resulting in again closing the exhaust. Thus the damper is opened slightly and remains in this position until a further change of steam pressure takes place. In the event of a further reduction in the steam pressure, these movements will be repeated until the piston of the motor 13 reaches its lowermost position, i. 6., the end of its stroke, in which position Upon a rise in steam pressure the stem of the exhaust valve is first lifted far enough to close the exhaust, and it arrives at its point when the steam pressure becomes normal. Upon a further rise in steam pressure, above normal, the valve stem 25 will be further lifted by the yoke connection to the steam governor and in this movement as the valve 28 engages its seat it lifts the sleeve 21 therewith, raising the inlet valve 20 from its seat and admitting water to the motor, whereupon the piston of the motor rises until by the cam action described, the valve body is lifted closing the admission valve. Further increase of steam pressure will of course repeat this operation until the damper is fully closed.

It is to be noted that in the described operations the valve structure set forth is adapted to respond instantly to variations in steam pressure, and open either the exhaust or the inlet valve as required with the smallest movement imparted to the valve stem from the yoke 32. Further, that while the valve design is simple and substantial with an entire absence of intricate parts that would be liable to break or get out of order, it is adapted to effect a tight and reliable closure I of the ports in each case and is especially adapted to cooperate with a steam pressure apparatus of the type set forth because it is specially designed to hold the motor at an intermediate position with a capability of sensitive response for varying such position according to the operation of the steam pressure controller.

I do not desire to be limited in all respects to the illustrative details of construction shown and refer to the appended claims rather than to the foregoing description to indicate the scope of the invention.

Having described my-invention, what I claim as new and desire to secure by Letters Patent is:

1. Apparatus of the kind described, comprising a valve body having inlet and exhaust ports and an intermediate delivery port, and a valve stem slidably arranged in said body and having slidably mounted thereon a sleeve, said sleeve having at its end a .valve adapted to be pressed against a seat for controlling the passage from said delivery port to one of the other ports, said sleeve having a passage therethrough from sa1d delivery port to the third port with a valve seat formation, and said stem having a valve to fit said seat and close said passage, said valves being arranged to open the one by a movement of said stem in one direction, and the other by a movement of the stem in the other direction.

2. Apparatus of the kind described, comprislng a valve body having a delivery port with inlet and exhaust ports leading thereto, and a valve stem slidably arranged in sa1d body to control said ports, said stem having a sleeve slidably mounted thereon with a valve formation at its end adapted to be pressed against a seat controlling the passage from said inlet port to said delivery port, said sleeve having a passage therethrough from said delivery port to said exhaust port and said stem having a valve for controlling said passage adapted to be pressed against a seat in said sleeve and to open by a relative movement between the stem and sleeve in a direction opposite to the opening movement of the valve at the end of said sleeve.

8. Apparatus of the kind described, comprising a valve body having a delivery port with inlet and exhaust ports leading there to, and a valve stem slidably arranged in said body to control said ports, said stem having a sleeve slidably mounted thereon with a valve formation at its end adapted to be pressed against a seat controlling the passage from said inlet port to said delivery port, said sleeve having a passage therethrough from said delivery port to said exhaust port and said stem having a valve for controlling said passage adapted to be pressed'against a seat in said sleeve and to open by a relative movement between the In testimony whereof, I have signed my stem and sleeve in a direction opposite to the name to this specification, in the presence of opening movement of the valve at the end tWo subscribing Witnesses.

of said sleeve, and a spring co'acting between JAMES L. KIMBALL. said sleeve and said stem for normally hold- Witnesses:

ing the valve on said stem against its seat B. J. blows,

in said sleeve. H. B.- DAVIS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

